These amulets in precious materials extended protection to their very healthy wearers, women and children, during the Middle Kingdom1. They are in alternative bands of sheet gold and amethyst or in granulated gold. They were containing magical spells1
Gold and amethyst H 7.0, W 1.3 Middle Kingdom Dynasty 12 Brooklyn Museum #51.226
Granulated gold H 4.8, Ø 0.8 Middle Kingdom Dynasty 12 Brooklyn Museum #37.701E
Granulated gold H 7.6, Ø 2.7 Middle Kingdom Dynasty 12 © The Trustees of the British Museum #EA24774
Reference
1Andrews C. Amulets of Ancient Egypt, 1994, p. 42 and Fig. 42